Mdthbs

Antler Helmet: Can it work?

Is it true to say that an hosting provider's DNS server is what links the entire hosting environment to ICANN?

How discoverable are IPv6 addresses and AAAA names by potential attackers?

Gastric acid as a weapon

Did Kevin spill real chili?

What makes black pepper strong or mild?

What's the purpose of writing one's academic bio in 3rd person?

Bonus calculation: Am I making a mountain out of a molehill?

What is the musical term for a note that continously plays through a melody?

Disable hyphenation for an entire paragraph

What would be the ideal power source for a cybernetic eye?

∞ symbol in external pdf disappears when used as figure

Why one of virtual NICs called bond0?

Why was the term "discrete" used in discrete logarithm?

3 doors, three guards, one stone

Why don't the Weasley twins use magic outside of school if the Trace can only find the location of spells cast?

Why did the IBM 650 use bi-quinary?

If a contract sometimes uses the wrong name, is it still valid?

How to bypass password on Windows XP account?

What are 'alternative tunings' of a guitar and why would you use them? Doesn't it make it more difficult to play?

When -s is used with third person singular. What's its use in this context?

Letter Boxed validator

How can I fade player when goes inside or outside of the area?

What happens to sewage if there is no river near by?

storing ssh remote executed command output to variable is blocking. connection not ending?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

1

I'm not quite sure what the issue is. I'm on Kali Linux 2.0 right now, fresh install. The following worked on Ubuntu 14.04 but it's not working anymore (maybe I accidentally changed it?). It looks correct to me, but every time it runs it blocks.

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1')

This is part of a larger script. $server and $dir are set. When I run the command alone, I get the correct output, but it doesn't end the connection.

bash ssh openssh

share|improve this question

edited Oct 16 '15 at 9:19

sand_storm_of_code.txt

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

bumped to the homepage by Community♦ 3 hours ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  just FYI, it works for me on Ubuntu 15.04. I also don't see anything wrong on the first sight.
  
  – Jakuje
  Oct 15 '15 at 21:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You may want to quote the $dir expansion, lest you might run into problems if $dir ever expands to a path that contains whitespace or shell metacharacters.
  
  – a CVn
  Apr 15 '16 at 9:14
  
  
  

  
  
  
  

add a comment | 

1

I'm not quite sure what the issue is. I'm on Kali Linux 2.0 right now, fresh install. The following worked on Ubuntu 14.04 but it's not working anymore (maybe I accidentally changed it?). It looks correct to me, but every time it runs it blocks.

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1')

This is part of a larger script. $server and $dir are set. When I run the command alone, I get the correct output, but it doesn't end the connection.

bash ssh openssh

share|improve this question

edited Oct 16 '15 at 9:19

sand_storm_of_code.txt

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

bumped to the homepage by Community♦ 3 hours ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  just FYI, it works for me on Ubuntu 15.04. I also don't see anything wrong on the first sight.
  
  – Jakuje
  Oct 15 '15 at 21:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You may want to quote the $dir expansion, lest you might run into problems if $dir ever expands to a path that contains whitespace or shell metacharacters.
  
  – a CVn
  Apr 15 '16 at 9:14
  
  
  

  
  
  
  

add a comment | 

I'm not quite sure what the issue is. I'm on Kali Linux 2.0 right now, fresh install. The following worked on Ubuntu 14.04 but it's not working anymore (maybe I accidentally changed it?). It looks correct to me, but every time it runs it blocks.

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1')

This is part of a larger script. $server and $dir are set. When I run the command alone, I get the correct output, but it doesn't end the connection.

bash ssh openssh

share|improve this question

edited Oct 16 '15 at 9:19

sand_storm_of_code.txt

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1')

share|improve this question

edited Oct 16 '15 at 9:19

sand_storm_of_code.txt

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

share|improve this question

edited Oct 16 '15 at 9:19

sand_storm_of_code.txt

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

asked Oct 15 '15 at 20:55

sand_storm_of_code.txtsand_storm_of_code.txt

14117

2 Answers
2

active

oldest

votes

0

I'm not entirely sure why the command would hang, but you don't need to run the whole pipeline on the server. It's enough to do the ls there:

backup_folder=$( ssh -i keyfile "$server" "ls -t '$dir'" | head -n 1 )

Note that this quotes the $dir value on the remote side (it will still be expanded locally). The head will run locally.

This also comes with the caveats mentioned in the answers to "Why *not* parse `ls`?".

share|improve this answer

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

add a comment | 

-1

I have had the same issue recently, probably you should add a redirection to stdout at the end of the command, like so:

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1' 2>&1)

share|improve this answer

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That would cause error messages to be part of the $backup_folder string.
  
  – Kusalananda♦
  Jun 20 '18 at 13:47
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f236503%2fstoring-ssh-remote-executed-command-output-to-variable-is-blocking-connection-n%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

0

I'm not entirely sure why the command would hang, but you don't need to run the whole pipeline on the server. It's enough to do the ls there:

backup_folder=$( ssh -i keyfile "$server" "ls -t '$dir'" | head -n 1 )

Note that this quotes the $dir value on the remote side (it will still be expanded locally). The head will run locally.

This also comes with the caveats mentioned in the answers to "Why *not* parse `ls`?".

share|improve this answer

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

add a comment | 

0

I'm not entirely sure why the command would hang, but you don't need to run the whole pipeline on the server. It's enough to do the ls there:

backup_folder=$( ssh -i keyfile "$server" "ls -t '$dir'" | head -n 1 )

Note that this quotes the $dir value on the remote side (it will still be expanded locally). The head will run locally.

This also comes with the caveats mentioned in the answers to "Why *not* parse `ls`?".

share|improve this answer

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

add a comment | 

I'm not entirely sure why the command would hang, but you don't need to run the whole pipeline on the server. It's enough to do the ls there:

backup_folder=$( ssh -i keyfile "$server" "ls -t '$dir'" | head -n 1 )

Note that this quotes the $dir value on the remote side (it will still be expanded locally). The head will run locally.

This also comes with the caveats mentioned in the answers to "Why *not* parse `ls`?".

share|improve this answer

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

backup_folder=$( ssh -i keyfile "$server" "ls -t '$dir'" | head -n 1 )

share|improve this answer

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

answered Jun 20 '18 at 13:52

Kusalananda♦Kusalananda

142k18265440

-1

I have had the same issue recently, probably you should add a redirection to stdout at the end of the command, like so:

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1' 2>&1)

share|improve this answer

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That would cause error messages to be part of the $backup_folder string.
  
  – Kusalananda♦
  Jun 20 '18 at 13:47
  

  
  
  
  

add a comment | 

-1

I have had the same issue recently, probably you should add a redirection to stdout at the end of the command, like so:

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1' 2>&1)

share|improve this answer

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That would cause error messages to be part of the $backup_folder string.
  
  – Kusalananda♦
  Jun 20 '18 at 13:47
  

  
  
  
  

add a comment | 

I have had the same issue recently, probably you should add a redirection to stdout at the end of the command, like so:

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1' 2>&1)

share|improve this answer

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12

backup_folder=$(ssh -i /home/dexter/.ssh/id_rsa $server 'ls -t '$dir' | head -1' 2>&1)

share|improve this answer

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12

answered Apr 15 '16 at 9:02

vpapakirvpapakir

12